I once met a Christian (Messianic Jewish) singer/musician/songwriter when I was in NY -- this was back when I was a kid. I absolutely love his music. Not only did he sign a songbook we got after the concert, but he explained to me a chord that I asked him about. All while he was playing. In fact, when he was explaining that chord, he went from playing the song he was playing to improvising on that chord. Best day of my life, most memorable item and associated memory.